THE MONTHLY BULLETIN. ■ 337 



In the check moist chamber, as in Experiment No. 6, some of the 

 scales had left the twig. These were included in the results. In the 

 sprayed sample, however, no scales had left the twigs, probably being 

 held on by the fungus which covered many of them. 



Fig. 70. — Isaria fungus attacking black scale 

 on lemon twigs in moist chamber in laboratory, 

 as explained in Experiment 6. (Original.) 



Experiment No. 8, March 16, 1915. 



Ten twigs infested with scale were used in this experiment, which is 

 again a duplicate of the two previous experiments. Seventy-two per 

 cent of the scales were alive at the beginning. 



On April 27th all the twigs were examined with the following result : 



Sprayed twigs Check twigs 



Number of scales examinedi ■. 505 489 



Percentage alive 45' 72 



